Thermostat damper and pipe control



Feb 7 195@ J. REIL THERMOSTAT DAMPER AND PIPE CONTROL 2 Sheets-Sheet 1 Filed Nov. 23, 1946 \NVENTOR JOHN REIL ATTOR NEYS Feb. 7, 3950 .J. REIL 2496 4130 THERMOSTAT DAMPER AND PIPE CONTROL.

Filed Nov. 25, 1946 2 Sheets-Sheet 2 INVENTOR JOHN REiL ATTORNEYS Patented Feb. 7, 1950 UNITED STATES PATENT OFFI CE THERMOSTAT DAMPER AND PIPE CONTROL John Reil, Cudahy, Wis.

Application November 23, 1946, Serial No. 711,977

1 Claim.

This invention appertains to furnace and stove pipe dampers and more particularly to means for automatically operating the dampers of a smoke pipe of a furnace or stove according to the temperature of the furnace, stove or smoke pipe.

One of the primary objects of my invention is to provide means for automatically regulating both the draft damper in the smoke pipe and the check damper in the side or breaching of the smoke pipe according to the temperature of the smoke pipe, whereby both of the dampers will operate to the best of advantage for maintaining the desired fire in the stove or furnace.

Another salient object of my invention is to provide novel means for operatively connecting the thermostat element with a damper, whereby movement of the thermostat element through a change of temperature will be instantly transmitted to the damper for changing the position thereof.

A further object of my invention is to provide a novel link connection between the thermostat element and the damper, so that a direct pull or push, as the case may be will be exerted on the damper-to bring about the proper quick opening or closing thereof.

A further object of my invention is to provide means for manually shifting the draft damper laterally into and out of the path of a stop lug or the like, so that the damper can be held open against the action of the thermostat element during the making of a fire and the initial heating of a house or other building.

A still further object of my invention is to provide a novel damper control which can be placed upon the market at a reasonable cost and one which can be readily incorporated with the standard smoke pipe of a furnace or stove.

With these and other objects in view the invention consists in the novel construction, arrangement, and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawings, in which drawings,

Figure 1 is a fragmentary side elevational view of a smoke pipe leading from a furnace to a chimney showing my novel damper controls connected. with the draft damper and the check. dampen.

parts of the view being shown broken away and. in section to illustrate structural detail.

Figure 2 is a fragmentary top plan view of a furnace stove pipeshowing my novel damper controls incorporated therewith, parts of this view being also shown broken away and in section.

Figure 3 is a fragmentary detailv vertical'sec Figure 4 is a similar view, being taken on the" line 4-4 of Figure 1 looking in the direction of the arrows.

Figure 5 is a detail sectional view taken on the:

line 55 of Figure 1 looking in the direction of the arrows and illustrating the latch for holding the check damper in a closed position against the action of the thermostat.

Figure 6 is a detail vertical sectional view taken on the line 6--6 of Figure 1 illustrating a part of the control for the draft damper.

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views the letter P generally indicates a smoke pipe or flue leading from a furnace or stove to a chimney, the showing of the furnace and chimney being eliminated.

The smoke pipe P can be of the usual or any preferred character and arranged either in a vertical or horizontal plane. For the purpose of illustration, the smoke pipe P has been shown to be in a horizontal plane and the same includes a substantially cylindrical body section [0 provided with an outlet or breaching H opening into the atmosphere or room in which the stove or furnace is located. The breaching I I can be of substantially the same diameter as the diameter of' the smoke pipe Ill.

Rockably mounted within the smoke pipe body section It] is a draft damper l2 for controlling the amount of draft through the smoke pipe. Rockably mounted within the breaching H is a check damper l3 and this damper is utilized for breaking the draft in the smoke pipe by allowing the admittance of cold air into the smoke pipe between the furnace and the chimney.

My invention resides in the novel and automatic means for regulatingthe position of the draft damper l2 and the check damper l3. The mechanism for automatically regulating the draft damper [2 will now be described. I

- The draft damper l2 can be of the construction now found in most furnaces and can include a substantially disc shape damper plate l4 secured to a'diametrically extending rock shaft or damper rod i5. The rod I5 is mounted for turning or rocking movement in the stove pipe and if desired bearing plates It can be secured to the opposite sides of the smoke pipe for supporting the rod. The rod-is also mounted. for sliding movement within the smoke-pipe whereby the damper can be shifted laterally. One end of the rod or rod shaft I5 has formed thereon or secured thereto an operating handle ll whereby the damper can be manually turned. One bearing plate 16 can be provided with an outwardly extending stop lug 18, for a purpose, which will be later set forth and it is to be noted that an expansion spring 19 is coiled about the rod i5 and bears against the handle I! and one bearing plate [6 for normally holding the damper in a shifted lateral position to one side of the smoke pipa The opposite end of the rod from the handle I! has secured thereto for turning movement therewith a crank 20. The crank 20 includes an arm portion 2| which is normally disposed under the stop lug l8 and limits the upward swinging movement of the crank so as to limit the opening swinging movement of the damper l2 beyond a predetermined point. 'The spring l9 normally holds the crank in a position to strike this lug.

Fastened directly to the small pipe in close proximity to the rock shaft or rod i5 is a supporting bracket 22 and this bracket carries an outwardly extending arm 23. A thermostat element 24 is coiled about this arm and one end of the thermostat element is anchored to said arm as at 25. The coiled thermostat element is made from some suitable material effected by heat and can be made from a laminated strip of metal, the laminations of which have different coefficients of expansion. The outer convolutions of the thermostat element 24 terminates in an outwardly extending operating arm 26 and this arm is normally positioned directly above the crank 20. A link 21 is pivotally connected-to the crank 20 and to the outer end of the arm 26 of the thermostat element.

Upon movement of the thermostat element 24 due' to change oftemperature a direct pull or push, as the case may be will be transmitted to the crank 20 and consequently the damper will be instantly turned. Due to the position of the thermostat element, in close proximity to the smoke pipe, change of temperature in the smoke pipe will be immediately transmitted to the thermostat element.

A detachable housing 28 can be connected to the smoke pipe for enclosing the thermostat element 24 and the associate parts, so as to protect the thermostat element and its associate parts from dust, dirt and the like.

In operation of this damper, it can be seen that when a house or other building is cold and is calling for heat, the damper 12 will be in its open position as shown in full lines in Figure 1. This will allow the full draft through the furnace or stove. As the fire increases in the furnace due to this draft and the smoke pipe becomes heated by. the flow of hot gases therethrough, the thermo-;

stat element will be effected and the same will tend to expand. A downward thrust or push will be exerted on the link 21 and this downward movement will be transmitted to the crank 20 and the damper will start to close. As temperature increases the damper will be moved to a full closed position as shown in dotted lines in Fi ure 1.

h In the building of a fire in the furnace or when I the building is calling for a large amount of heat the damper can be held in its open position against the action of the thermostat. .This is accomplished in the following manner. The

' ried by the housing 28 and this screw can be adjusted toward and away from the arm 26 of the thermostat element 24 for limiting upward movement of this arm.

The check damper [3 in the breaching II also 'consists of a disc shaped damper plate 30, and this damper plate has secured thereto a diametrically extending rock shaft or rod 3|. The terminals of the rock shaft or red 3| are mounted for turning movement in bearing hinge barrels 32. These barrels are preferably struck up from an inwardly directed annular flange 33 formed on a carrying or supporting ring 34.

The ring 34 is of a size and shape to fit within the breaching H and the ring is preferably provided with an outwardly extending exterior flange 35 which is adapted to abut the outer edge of the breaching. The ring can be held in the breaching in any desired way.

Referring back to the damper 30, it is to be noted that the opposite sides of the damper are cut away, as at 36 adjacent to the opposite ends of the rock shaft-or rod 3|. and that the damper plate is offset at the rock shaft so that one half thereof will engage under the flange 33 and the other half thereof the top of the flange 33. By this arrangement the damper plate is free to rock and at the same time effectively open and close the breaching I I.

Rigidly secured to the ring 34 is a bracket plate 31 and this bracket plate has formed therein an opening 38 for the reception of a thermostat element 39. This element is of the same character and type as the element 24. The innermost convolution of the element is anchored to a cross shaft 40 which is in turn carried by the bracket plate 31 on each side of the opening 38, The outermost convolution of the element 39 carries an outwardly extending operating arm 4|. The outer end of the arm 4| has pivotally connected thereto a link 42 and this link is in turn pivotally connected as at 44 to the damper plate 30 at one side of the rock shaft 3|.

It is to be noted that the thermostat element 39 is in close proximity to the damper plate and is substantially confined within the supporting ring 34 and consequently this element is quickly effected by heat within the smoke pipe and the breaching I 1.

Considering that the damper plate 30 is normally closed and that the temperature of the pipe and breaching ll increases, then the element 39 will expand and a downward thrust will be exerted on the damper plate causing the rocking thereof to an open position, as shown in dotted lines in Figure 1. Upon the cooling of the element 39 and the contraction thereof a pull will be exerted on the damper plate and thesame will be moved to a closed position.

If for any reason it is desired to hold the damper plate 30 closed, against the action of the thermostat'means can be provided for holding the damper plate'closed. This means can con 7 slst orapivote'a' latchlev'er -45 carried directly by the damper plate and the lever, when the damper plate is in its closed position, can be moved into and out of latching engagement with a keeper hook 46 rigidly secured to the ring 34. In cases where it is desired to increase the heat in a cold building, the damper [3 can be rendered inactive by moving the lever into engagement with the keeper hook.

A set screw 47 can be carried by the bracket plate 4'! for movement toward and away from the arm 4| for limiting the movement thereof.

From the foregoing description, it can be seen that I have provided means for automatically controlling the position of the draft damper within a stove pipe and the check damper at the side of the stove pipe. These two dampers will operate in conjunction with one another and it can be seen that when the draft damper I2 is closed the check damper 13 will be open for breaking the draft from the chimney to the furnace.

Changes in details may be made without departing from the spirit or the scope of my invention, but what I claim as new is:

In a damper control for furnaces and stoves, a smoke pipe, a damper plate in said smoke pipe, a rock shaft rigidly secured to the damper plate and extending diametrically across the same, means rockably supporting the opposite ends of the rock shaft on the smoke pipe, a crank secured to one end of the rock shaft for movement therewith, a thermostat element including a coil disposed in close proximity to the smoke pipe, means anchoring the inner convolution of the coil to the smoke pipe, a right-angularly extending arm formed on the outer convolution of the element terminating above the crank, a link pivotally connected to the crank and to the arm for exerting a direct pull and push on the crank upon the action of the thermostat due to change of temperature, said rock shaft being also slidably mounted on the pipe, a stop member extending outwardly from said pipe, an arm formed on said crank adapted to engage the stop member in certain positions of said crank, spring means normally holding the rock shaft and damper in a predetermined position whereby the arm on the crank will engage the stop member, and means for manually shifting the rock shaft damper and crank against the tension of said spring means for moving the arm above or below the stop member.

JOHN REIL.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 1,370,785 Cooper Mar. 8, 1921 1,624,039 Dana Apr. 12, 1927 1,720,522 Ludwick July 9, 1929 1,971,431 Sigmon Aug. 28, 1934 2,035,974 McWilliams Mar. 31, 1936 2,083,844 Hitchcock June 15, 1937 2,223,918 Monney Dec. 3, 1940 2,262,948 Long Nov. 18, 1941 2,358,390 Field Sept. 19, 1944 

